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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report on Vacuum Gargoyle Hypoid Gear lubricant.

Identifier  ExFiles\Box 145\3\  scan0125
Date  3rd March 1937
  
TEST REPORT 753.B. (2)

Test on Vacuum Gargoyle Hypoid Gear lubricant.
(Fig No. 1.)

OBJECT OF TEST.
To try out extreme pressure oils under conditions of service of Automobile Work and note the effect of the lubricant on the bearings, and particularly brass cages, arising out of requests by Messrs. Austin Motors Ltd. and Wolseley Motors Ltd.
See our letter to Austin (CGHR/BO) Jan.12th 1937, and Mr. Hickling's report on visit to Wolseley Motors (13th Jan) dated 21st Jan.1937. Ref.FOH/AD.
See also V.O.C. correspondence in Tech.Office file and special "Excess Pressure Lubricants" file.

BEARINGS.
5/MDJT.30. (Brass cages).

LOAD.
1050 lbs. Journal. 1420 lbs. Thrust.

SPEED.
4500 r.p.m.

DURATION.
300 hours.

LUBRICATION.
Vacuum Hypoid Gear Lubricant (pump feed). See Drg. T.R.15.B. for arrangement of rig and oiling system.

MAXIMUM TEMP.RISE.
75°F.{Mr Friese}

NORMAL TEMP. RISE.
69°F.{Mr Friese}

SHOP TEMPERATURE.
70°F.{Mr Friese}

GENERAL REMARKS:
A pump feed was fitted to obtain a churning effect of the oil, the lubrication of the bearing itself being drip feed controlled by a tap, the bulk of the oil being by-passed into the reservoir.

Temperatures were taken on the outside of the housing and were very satisfactory considering the loads and speeds, as also was the condition of the 5/MDJT.30 bearing, this showing slight pitting on the thrust side of the races only.

The oil after a run of 300 hours was found to be in excellent condition, and all the working parts of the rig had been lubricated effectively.

No staining of the tracks on inners or outers, balls or cages was to be seen. There was, however, very slight staining on the outside of one of the outers but this should not be of any detriment to the bearing.

CONCLUSIONS.
This oil would be satisfactory as a ball or roller bearing lubricant in similar applications on Automobile Work, always providing that no factors can be introduced which are likely to cause chemical action in the lubricant and subsequent corrosion of bearing parts with which it comes into contact.
  
  


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